Threading die



S. SERA THREADING DIE 'Filed April 17 1924 v 2 Sheets-Sheet 1 Jan, 27. 1925.

"mum!" STEPHEN SERA, OF MGKEESPOR'I, PENNSYLVANIA.

v 524,534 rice.

THBEADING DIE.

Application filed April 17, 1924. Serial No. 707,163.

T all whom it may concern:

Be it known that I, STEPHEN SEBA, a citizen of the. United States of America, 'residing at McKeesport, in the county of 6 Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Threading Dies,-of which the following is a specification. I

1 This invention relates to certain new and useful improvements in threading dies and has particular reference to the mounting and adjustability of the cutter bars or blades of the die block, the die being of the type for threading external threads upon an object.

with relatively-movable sectional members comprising wedging devices cooperating with sliding pins that engage the rear edge 'of the thread cutters for varying the pro- ;jection of the" cutters within the central opening in the die block.

-With the above and other objects in view as the nature of the invention is better understood, the same consists of the novel form, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawings and claimed.

In the drawings, wherein llke reference characters designate corresponding parts throughout the several views,

Figure 1 is a top plan view of the threading die constructed in accordance with the present invention,

Figure 2 is a side elevational view of thesame,

.40 Figure 3 is a sideelevational view of one section of the die,

' Figure 4 is a cross-sectional view'takenon line IV-IV of Fig. 1 showing the bolt for securing the face plate to the die block,

Figure 5 is a detail sectional view taken on the line VV of Fig. 1 showing the adjustable mounting for one of the thread cutting blades, and I Figures 6 and 7 show side and edge elevalfl tional views of the screw-operated two-part wedge blocks for adjusting the thread cutting blades.

.The threading die embodies a block formed of mating semi-circular sections 1 having registering semi-circular openings forming a central" circular opening into which thread cutting blades carried by the die block extend, the die block sections being assembled in any convenient manner. Face plates 2 are secured to thedie block sections at the sides thereof facing the open sides of the pockets that house the'thread cutter blades.

Each of the die block, sections is provided with a plurality of spaced tangentiallye dlsposed pockets 3 opening atrthe center of the block and also open at the side. of the block adjacent'theface plate 2 as shown in Fig. 5, a thread cutting plateA-having a cutting edge 5 being ad ustably mounted in eachlpocket 3 as illustrated. The face plate 2 is secured to its corresponding die block section by the bolts 7 as illustrated in Fig. 4. I 1

The adjustable mountingfor the thread cutting blades 4 include the provision of an opening 8 in the die block in the wall thereof alined with the pocket 3, an opening 9 forming communication between the rear end of the pocket 3 and the opening 8 at a point spaced from the bottom wall 8 of the opening 8 as shown in Fig. 5. A pin 10 projecting through the opening 9 and spaced from the side walls thereof, the pin being freely supported in the disk 11 and having the headed end 12 thereof disposed in the opening 8. A stud screw 13v is threaded through the side wall of the blocksection 1. alined with the pin 10 with the head of the pin normally abutting the inner end thereof.

A screw-operatedtwo-part wedge mem- Y ber entends into eaohpocketS for shifting the p111 10 in. a direction toward the pocket 3 for pro ecting the thread cutting blade linto the central opening of the threading d1e,'the outer face of the base plate 2 being,

provided with a relatively large socket 14: having areduced opening 15 in the bottom wall thereof alined with the opening 8 and through which opening 15 the threaded portion 16 of the rod 17 freely projects. The rod 17 is provided with a disk'18 atthe outer end of the threaded portion 16 that is disposed within'the pocket- 14: and engages the gasket 19inte'rposed between the disk and the bottom wall of the pocket, the

outer end of the rod 17 being provided with p the threaded end 16 of the rod is received, the head 21 carrying a reduced extension 22 having oppositely disposed foutwardly directed shoulders .23 at the outer end thereof as clearly shown in Figs. 6 and 7. The wedging point 24 of the two-part wedge member is provided at the larger end thereof with oppositely positioned legs 25, the adjacent faces of which are icut-away at their inner ends. as at 26 providing a transthestud screw 28 threaded through the face plate 2 and engaging the faced strip 29 positioned against the adjacent side edge of the blade as shown in Fig. 5.

The block sections of the threading ,die

being assembled as illustrated in Fig. 1, the same isrsuitably supported in a machine by devices entering the openings 30 in the block and face plate sections and the thread cutting blades .4 are adjustedtangentially of the die block sections by the wedge members above described' The tapered ends of the sections 24 of the two-part wedge members are forced between the stud screw 13 and the head 12 of the pin 10, the free mounting of the section 24L upon the head 21 of the wedge member causing the section 2% tobe self-centered or properly positioned relative 'to the stud screw and pin, this movement being effected by rotation of the rod 17 having its threaded portion 16 cooperating with the head 21. The pin 10 is shifted'into the pocket 8 for engaging the rear edge of the thread cutting blade l to vary the cutting edge 5 thereof with respect to the central opening in the diehead, the blades 4 being retained in adjusted positions by the screws 28.

From the above detail description of the device, it is believed that the construction and operation thereof will at once be apparent, and while there is herein shown and described the preferred embodiment of the present invention, it is nevertheless to be understood that minor changes may be made therein without departing from the spirit andscope of the invention as claimed.

hat is claimed as new is 1. In a threading die of the type described, a die block, thread cutting blades carried by the block and extending into a central opening of the block, pins slidably carried by. the block engaging, the rear edges of theblades and screw-operated wedge menr bers engaging the pins to move the cutting edges of the blades into the block opening, each wedge member formed of interengaging wedge sections with the tapering end of the inner wedge section engaging the adjacent pin.

2. In a -threading die of the type described, a die block, thread cutting blades carried by the block and extending into a central opening of the block, pins slidably carried by the block engaging the rear edges of the blades, screw-operated wedge members engaging the pins to move the .Cutting of the blades,screw-operated Wedge members engaging the pins to move the cutting edges ofthe'bladeslinto the block opening, said block having openings therein, each alined with a cutting blade with the rear end ofthe pin extending therein, an adjustable, screw threaded in-the block alined with the pin and extending into the opening and said wedge members moving between the pins andscrews for shifting the pins and cutting'blades engaged by the pins.

e111 a threading die of the type described, a die block, thread cutting blades carried by the block and extending into a central opening of the block, pins slidably carried by the block engaging the rear edges of the blades, screw-operated wedge members engaging the pins to move the cutting edges of the blades into the block opening,

said block having openings therein, each alined, with a cutting blade with the rear end of the pin extending therein, an adjustable screw threaded in the, block alined with the pin and extending into the opening and said wedge members being formed of relatively movable interengaging sections with the tapering ends of the wedge sections moving between the pins and screws and screws carried by the block engaging the wedge members to cause thetapered ends thereof to shift the pin and cutting blades carried engaged thereby.

5.In a threading die of the type described, a die block, thread cutting blades carried by the block and extending into a central opening ofthe block, pins slidably carried by the block engaging the rear edges of the blade, screw-operated wedge members engaging the pins to move the cutting edges of the blades into the block opening, set screws carried by the block adapted to engage one side of the blades for holding the same in adjusted positions, said block having openings therein, each alined with a cutting blade with the rear end of the pin extending therein, an adjustable screw threaded in the block alined with the pin and extending into the opening and said 10 wedge members being formed of relatively movable interengaging sections with the tapering ends of the wedge sections moving between the pins and screws and screws carried by the block engaging the wedge members t0 cause the tapered ends thereof to shift the pins and cutting blades carried engaged thereby.

In testimony whereof I affix my signa ture.

STEPHEN SERA. 

